I was in 2nd grade I believe. I was coming back from a trip to the restroom at school, and saw a bunch of teachers gathered around a television set watching the news in an otherwise empty common room, only I thought it was a movie of some sort.
I tried to stick around to watch it, but one of the teachers shooshed me back to class.
I can't remember anything else; whether we were sent home early, what my parents said about it, how it was explained it to me, none of it. Just that.
I don't think we were told about it much that day in school, but we were in Texas. NYC and the Pentagon were half the country away.